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Reports <code>filter…</code> calls from the standard library on already filtered collections.
<p>Several functions from the standard library such as <code>filterNotNull()</code> or <code>filterIsInstance</code>
    have sense only when they are called on receivers that have types distinct from the resulting one. Otherwise,
    such calls can be omitted as the result will be the same.</p>
<p><b>Remove redundant call</b> quick-fix can be used to amend the code automatically.</p>
<p>Example:</p>
<pre><code>
  fun test(list: List&lt;String&gt;) {
      val x = list.filterNotNull() // quick-fix simplifies to 'list'
      val y = list.filterIsInstance&lt;String&gt;() // quick-fix simplifies to 'list'
  }
</code></pre>
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